|Medical Dictionary - Dictionary of Medicine and Human Biology|
An antibiotic derived from metabolites of fungi, such as species of Aspergillus, Penicillium, and Gymnoascus; has carcinogenic activity.
SYN: patent. [L. patulus, fr. pateo, to lie open]
A joint condition in which only a few (>1, <5) joints are involved [L. pauci, few, + articular]
Made up of, or denoting the presence of, few bacilli.
SYN: oligosynaptic. [L. paucus, few, + synapse]
Gustav, Austrian physician, 1859–1935. See P. reaction, P. test, P.-Bunnell test.
Wolfgang, Austrian-U.S. physicist and Nobel laureate, 1900–1958. See P. exclusion principle.
Linus C., U.S. chemist and Nobel laureate, 1901–1994. See P. theory, P.-Corey helix.
Temporary stop. [G. pausis, cessation] apneic p. cessation of air flow for more than 10 seconds. See sleep apnea. compensatory p. the p. following an extrasystole, when the p. is long enough to compensate for the prematurity of the extrasystole; the short cycle ending with the extrasystole plus the p. following the extrasystole together equal two of the regular cycles. postextrasystolic p. the somewhat prolonged cycle immediately following an extrasystole. preautomatic p. a temporary p. in cardiac activity before an automatic pacemaker escapes. SEE ALSO: escape. respiratory p. cessation of air flow for less than 10 seconds. See sleep apnea. sinus p. a spontaneous interruption in the regular sinus rhythm, the p. lasting for a period that is not an exact multiple of the sinus cycle. SEE ALSO: sinus arrest, sinus standstill.
Lucien M.A., French dermatologist, 1876–1959. See P. abscess, P. microabscess.
Jean E., 19th century French physician.
Ivan P., Russian physiologist and Nobel laureate, 1849–1936. See pavlovian conditioning, P. method, P. pouch, P. stomach, P. reflex.
pavor nocturnus (pa′vor nok-ter′nus)
SYN: night terrors. [L.]
Frederick W., English physician, 1829–1911. See P. disease.
J. Howard, U.S. surgeon, *1916. See P. operation.
Erwin, German surgeon, 1871–1946. See P. clamp, P. membrane, P. sign.
Symbol for lead (plumbum).
Abbreviation for porphobilinogen.
Abbreviation for protein-bound iodine.
Abbreviation for L. post cibum, after a meal.
Abbreviation for passive cutaneous anaphylaxis; patient-controlled analgesia; patient-controlled anesthesia.
A way of reporting calcium ion levels; equal to the negative decadic logarithm of the calcium ion concentration.
Abbreviation for polychlorinated biphenyl.
Abbreviation for patient care information system, the interactive computer system used to store medical records in a hospital.
Abbreviation for p-chloromercuribenzoate.
P congenitale (kon-jen-i-ta′le)
The P-wave pattern in the electrocardiogram seen in some cases of congenital heart disease, consisting of tall peaked P waves in leads I, II, aVF, and aVL (usually largest in lead II) with predominant positivity of diphasic waves in V1–2.
Abbreviation for phencyclidine; Pneumocystis carinii pneumonia.
Abbreviation for polymerase chain reaction.
1. Abbreviation for porphyria cutanea tarda. 2. Abbreviation for patient care technician.
Abbreviation for pulmonary capillary wedge pressure.
Abbreviation for phenyldichloroarsine.
Symbol for palladium.
Abbreviation of prism diopter.
An electrocardiographic syndrome characteristic of overloading of the right atrium, often erroneously called P-pulmonale because the syndrome can result from any overloading of the right atrium ( e.g., tricuspid stenosis) and independently of cor pulmonale.
Abbreviation for platelet-derived growth factor.
Abbreviation for Periodontal Disease Index.
Abbreviation for pulsed dye laser.
Abbreviation for pulseless electrical activity.
peach kernel oil (pech ker′nel)
See persic oil.
The top or upper limit of a graphic tracing or of any variable. [M.E. peke, pike, fr. Sp. pico, beak, fr. L. picus, magpie] biclonal p. two narrow electrophoretic bands thought to represent immunoglobulins of two cell lines. juxtaphrenic p. (juks-ta-fren′ik pek) on chest radiograph, a triangular density on top of the right diaphragmatic shadow, probably caused by tension of the phrenic nerve on the pleura over the diaphragm. monoclonal p. a narrow band visible on electrophoresis or an abnormal arc seen on immunoelectrophoresis, thought to represent immunoglobulin of one cell clone.
peanut oil (pe′nut)
Oil extracted from the kernels of one or more cultivated varieties of Arachis hypogaea (family Leguminosae); used as a solvent for intramuscular injections and in the preparation of foods. SYN: arachis oil.
Raymond, U.S. biologist, 1879–1940. See P. index.
1. A concretion formed around a grain of sand or other foreign body within the shell of certain mollusks. 2. One of a number of small tough masses, such as mucus occurring in the sputum in asthma. 3. SYN: keratin p.. Elschnig pearls focal retention of lens fibers that have undergone proliferative and degenerative changes surrounded by lens capsular fragments seen after extracapsular cataract extraction. enamel p. SYN: enameloma. epithelial p. SYN: keratin p.. Epstein pearls multiple small, white, epithelial inclusion cysts found in the midline of the palate in newborn infants. gouty p. SYN: tophus. keratin p. a focus of central keratinization within concentric layers of abnormal squamous cells; seen in squamous cell carcinoma. SYN: epithelial nest, epithelial p., p. (3) , squamous p.. Laënnec pearls obsolete term for small, round, translucent, tenacious bodies in the sputum of some persons with asthma; when floated in water, they become unfurled and are then recognizable as Curschmann spirals. squamous p. SYN: keratin p..
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